Boring-machine.



E. T. MILLER.

eomwe MACHINE. APPLICATION FILED APR. 13, I917.

1 ,265,231 Patented May 7, 1918. Y

10 SHEETS-SHEET i.

WITNESSES:

Arm/mm E. T. MILLER.

BORING MACHINE.

APPLICATION FILED APR. 13. 1917.

Patented May 7,1918.

V INVENTOR A TTORNEYS I E. T. MlLLER.

BORING MACHINE.

APPLICATION FILED APR. 13. m1.

Patentd May 7, 1918.

I0 SHEETS-SHEET 3 ab. m

A FOR/V578 E. T. MILLER.

BORING MACHINE.

APPLICAHON FILED APR. 13. m1.

Patented May 7, 1918.

r| llll I ll] INVENTOR E 210ml? JILLG/J I WITNESSES A TTORNEYS E. T.MILLER. BORING'MACHINE. APPLICATION FILED APB. 13. L917- Patented May7,1918.

10 SHEETS-SHEET 5.

'ATTORit/EYS:

E. T. MILLER BORING MACHINE. 7 APPLICATION FILE D APR. 13, 1917.

Patented May 7,1918.-

10 swans-sash s INVENTOR E ma/lTJlfu/er ATTORNEYS E. T. MILLER.

BORING MACHINE.

APPLICATION man APR. l3, 1917 Patented Ma y 7,1918.

10 SHEETS-SHEET 8- i WQ 92' 9/6/94 .2???

[III/MW '7/l/l/l///////////////I/////// WITNESSES Q mi mm A TTORNEYS E.T. MILLER.

BORING MACHNE.

APPLICATION FlLED APR 12 Ian.

Patented May 7, K918.

l0 SHEUS-SHEET 9.

,4 TTOR/VEYS E. I. MILLER.

BORING MACHINE.

APPLICATION FILED APR. 13. law.

PatenteC- Jay 7, 1918.

10 SHEETS-SHEET I0.

WITNESSES.-

A TTORIVE rs er a EMMA r. MILLER, or SAN ANTONIO, TEXAS. I

' BORING-MACHINE.

- Specification of Letters'latent.

Application filed April. 13, 1917. Serial No. 161,836.

To all whom it may concern:

Be it known that I, EMMA T.-l\I1LLER, a citizen of the United States,and a resident of San Antonio, in the county of Bexar and State ofTexas, have invented a certain new and useful Improvement inBoring-Machines, of which the followingis a specification. I

My present invention relates generally to boring machines, and moreparticularly to machine for boring brush blanks, my primary objectbeingto provide a machine which will bore all of the necessary openings, bothstraight and at an angle, at a single operation. I i

Among the various other objects of the invention, I aim to provide apair of relatively movable boring heads, each having a battery of'bits,together with means whereb to so move the short bits as to cause quicclean. movement. of the same into the blanks.

Another obiect is to provide relatively movable boring heads, togetherwith means controlled by the movements of the head, for automaticallyfeeding I blanks therebetween.

A still further object of the invention is to provide simple andeffective means for discharging the bored blanks and disposing'of thechips or cuttings.

Furtherobjects and the advantages of my invention, will be betterunderstood from the following description thereof, in which reference ismade to the accompanying drawin s formin arts of this s )ecilication andwherein- Figure 1 is a partial side elevation, portions being brokenaway and in section.

Fig. 2 is a partial front elevation.

Fig. 3 is a fragmentary detail elevation of a portion of F ig. 2. I a

Fig. 4 is a horizontal section taken substantially on line H of Fig; 1.

Fig. 5 isyan enlarged detail of a portion of Fig. 4.. I v

Fig. 6 is a vertical transverse section taken. substantially on line 66. of Fig. 4.

Fig. 7 is a sectional view showing on an enlarged scale a portion ofwhat is shown in Fig. 4. I

Fig. 8 is a detail.v fragmentary perspective view of parts to behereinafter specifically referred to. I Figs. 9 and 10 are verticalsectional views taken respectively on linesll-) of Figs."l and 7.

; Patented May 7,1918. 1

Fig. 11 is a vertical sectional View taken on line 11-11 of Fig. 4..

Fig. 12 is an enlarged detail" section on y line 12-12 of Fig. 11. I

Fig. 13 is a view similar toFig. 11 with the boring heads open. Y I iFig. lat .is an enlarged detail of certain of the gearing connectionsshown in F ig.9.

Fig. 15 is a detail vertical sectiontaken substantially on line 15-15 ofFig. 4, with the boring heads open.

heads closed.

Fig. 17 is a detail vertical section taken:

Fig. 16 is a similar v1ew with the boring c, f

the adjacent portions of the boring heads I .and a blank held inposition therebetween.

Fig. 19 is a detail horizontal section taken substantially on line 19.19of Fig. 18,,with I the boring heads open.

Fig. 20 is a similar vlew with the boring heads closed. I I

Fig. 21 is detail perspective view of one of the bits.

Fig. 22 is an enlarged detail section taken on line 22-22 of Fig. 17. I

Figs. 23 and 24 are detail-sectionstaken;

substantially on lines 23-23 andfitefi of Fig. 16. a

Fig. 25 is a vertical section taken on line 25ers of Fig. 10.

Figs-2'6, 27, nd 28 are enlanged detail v sections ihrough certainmodified forms of bits.

Fig. 29 isa detail side view partly in section, showing the automaticfeeding parts as a blank 1s clamped between theboring heads.

Fi 30 is a similar view showing theparts I '0 picking up a. new blank.

Fig. 81 is a side View of the weight co n I trolling connections.

Fig. 3-2 isa vlew similar to Fig.1'30 Witl1Q the new blank ready forlowering intov the space between the boring heads." U

Fig. is a view showing the initial'position ofone of'the grapplinghooks'to engage a pair of blanks. Fig. 34 is a detail perspective viewof one of the clamps for-holding-a'pair otblan ks. Fig. 35 isadeta'il'view part-lyinelevation I and partly in section illustratingportions of the chip and bored brush back discharging means, the chip anbeing tilted.

Fig. 36 1s a similar view with the chip pan in operative position, and

Fig. 37 is a detail vertical section taken substantially on line 3737 ofFig. 36.

Referring now to these figures, and par ticularly to Figs. 1 'and 2, myimprovements are preferably mounted'in a generally rectangular frame 50,at the sides of which are inner rectangular. frames 51, within thelatter of which the opposing boring heads 52 and 53 are movablehorizontally toward and away from one another, these boring wheels 61,each of which gear wheels is thus located adjacent one corner of themain frame 50.

The sliding joint between the shafts 59 of the gear wheels 61, and theshafts 5st and 55 of the boring head, thus admits of relative movementof the boring heads with respect to one another, it bein understood byref- 4 erence to Fig. 4 that tie two shafts 54 are adjacent relativelyopposite sides of the bor-' ing head 52 and the two shafts 55 are sim1-'larly adj acent'relatively opposite ends of the boring head 53.

. The inner portions of the several shafts 54. and 55 extend. into therespective boring heads between relatively fixed inner and outer sideplates 62 and 63 at opposite sides of each boring head and throughannular controlling rings 64, the shafts being provided within the rings64 with gear wheels 65, the latter in driving connection wlth theinnertgeared peripheries 66 of the said rings 64 ithixough series ofidlers 67,-as plainly' seeri by reference to Fig. 6', these idlers beingjournaled in spaced outer and inner plates 68 and 69 between which therings 64: aredisposed and rotatable.

The several rings 64 are provided with annular cam grooves 70 which, asbest seen in Fig. 1, are engaged by rigid lugs 71 projecting inwardlyfrom the upper and lower portions of the inner frames 51 and which thuscause relative movement .of the boring heads.

52 and 53 toward and away'from one another during rotationof the shafts54 and 55.

Referring again to Figs. 1 and 2, a driving motor 72 is mounted in thelower portion of the main frame 50 and its shaft 73 is,

provided with a gear wheel 74 driving a pair of master gears 75 mountedupon a shaft '76, each of the said master gears 75 rotating the twoshafts 59 of one of the boring heads, the connections at the rear of theframe for boring head 52 being identical with those at the forwardportion of the frame for boring head 53, andas clearly seenin Fig. 2.

Thus, as seen in Fig. 2, the master gear 7 5 at the portion of the mainframe, directly connects with the the shafts 59 of boring head 52, andwith an intermediate idler 77 in turn in engagement with the gear wheel61 of the other shaft 59 of the boring head. 52, so as to rotate the twoannular rings 64 of the boring head 52 in relatively oppositedirections, as indicated by the arrows in Fig. 2, these rings 64 beingprovided with laterally outstanding lugs 78 at diametrically oppositepoints projecting beyond the outer stationary plate 68 of the saidrings, for a pur-, pose which will be presently described.

To the outer side plate 68 as shown in Fig. 2, are pivotally connected,at 79, the outer ends of a pair of weight lifting arms 80, the innerends of which are free to swing vertically under actuation of the lugs78 in the travelof the latter, the arms 80 being thus elevated to thedotted line positions in Fig. 2, twice during each complete revolutionof the rings 64, said arms falling to the position shown in full linesafter the release of the corresponding lugs 7 8 from the upper free endsof the arms in the raised position thereof. A weight 81 is verticallymovable in the forward portion of the frame and is alternately raisedand released by the arms 80,

the latter upon their release from lugs 78 gear'wheel 61 of oneoffalling against stops 82 attached to the plate 68 and one of which isshown in Fig. 3, springs 83 being also secured to. the plate 68 toreceive the arms 80 and absorb the shock of contact thereof with thestops 82.

The weight 81 is suspended by flexible connections 84 attached at theirlower ends adjacent the opposite ends of the weight and the upperportions of which straps pass upwardly and. rearwardly over. guiderollers 85 and 86 and-'-through the slottedupper ends 87 of a pair ofvertically swinging arms 88 at opposite sides of the main frame 50,these arms being connected adjacenttheir up or ends by across piece 89,see Fig.- 2,- .and eing fulcrumed adjacent their lower-fiends at 90 uponbrackets 91 upstanding! from the sides of the frame 50, the lowerextremities of the arms 88 being connected by exible connections 92passing forwardly arpund guides 93 and attached to the outer plates 68of the boring head 53, as clearly seen in Figs. 1

and 29.

The outer ends of the straps 84 are secured to grappling members 94which, upon downupwardly against the upper ends of the arms Figs. 29 and30, it being-noted from Fig.

.ward movement of the weights 81 are borne -88 to the position shown infull lines in 33 that each of the grappling members 94 is provided withan enlarged cam-shaped outer head 95 having an inwardly project ing spur96.

Referring again to Figs. 1 and 2, the brush blanks 97 are superposedupon one another in pairs within a receptacle formed therefor in therear portion of the frame 50, andin forwardly and upwardly inclinedrelation upon the forwardly and upwardly channeled spring metal toreceive and clamp the edges of a pair of blanks in face to facerelation, and preferably spaced apart slightly by means of internal lugs96 carried by the clamp 96, and, as seen in Fig. 34, engagement of thespurs 96 in the clamp openings 96 is caused by rollers 95 carried by thereceptacle base 98 and against which the heads 95 move, one of saidrollers being shown in Fig. 33.

The operation of these parts is as follows:

' lVith the heads 52 and 53 spaced apart, as

seen in Fig. 32, the arms 88 are held in upright'position by the strapconnection 92 at the lower ends thereof with the head 53, and thusduring raising movement of the we1ght 81 by the arms 80 the grapplingmembers 94, with the blanks 97 engaged thereby, are lowered between thespaced boring heads, and the blanks 97 are engaged and held by themaster bits of the two bormg heads when the latter are again movedtoward one another, at the time the weight 81 is released, the grapplingmembers 94 being at the same time disengaged from the blank clampedbetween the boring heads by means of angular spaced lugs 100, as shownner iii led side plates 62 of the boring head,

which lugs engage between the side edges of the clamp 96 and thegrappling members 94 and force the latter away from the blank and thusfreethem of engagement there with. as seen by comparison of Figs. 19and,20.

The arms 80 and weight 81 after falling, again start to rise uponengagement there:

with of the next successive lugs 78, and the boring heads 52 and 53being closed at this time, vertical movement of the weight 81 permitsthe arms 88 to fall rearwardly t0 the position shown in Fig. 30, andthus, when the boring heads 52 and 53 again move away in Fi s. 19 and20, and carried by the in-.

' arms 88 are drawn upwardly tothe position shown in Fig. 32, and whilethe boring heads are open, upward movement of weightSl permits thegrappling members 94 with e'n gaged blanks, to descend betweenthe boringheads from the position shown Fig. 32. After the boring operation,"theblanks now bored to form brush backs,'andprviously released from thegrappling members 94 in the manner described, are permitted to drop outof the space between 'theboring heads 52 and 53 when the latter aremoved to open position. The blanks so releasedare prevented fromfollowing the movement of either of the boring beads by springs 101,shown in Figs. 18, 19, and 20,which roject inwardly from the fixed innerside p ate 62 62 of each of the boring'heads and engage the oppositefaces of theblanks adja- 85 cent the side edges thereof. The bored brushbacks dropping from the space between the boring heads as described fallthrough the lower opening 102 of a trough 103 sup ported in the lowerportion of the inner frames 51 below the boring head, as shown in Fig.35, and will be deflected by an inclined plate 104 into an inclinedlaterally projecting chute 105, as'seen also in Fig. 4. The space belowthe opening 102 of the trough 108 is normally taken up by a chipreceiving pan 106, tilt'able at properly spaced intervals, as showninFig. 35,

to permit the bored blanks to descend into the chute 105 in the manner:jnst previ-i ously described, and to discharge the-chips receivedtherein during theboring opera; tion, into a laterallyprojectingdischarge chute 107 for the chips or borings. To this end, thetrunnions 108 at the ends of the pan 106, as shown in Fig. 1, and whichare jonrnaled in brackets109 depending from the inner rectangular frames51, arelprovided. with gear wheels 110 in mcshwith the teeth of rackbars 111, the latter having bearings 112 attached to theinnerrectangular frames 51 and having upper a ngu'-, lar opposite ends 113extending through and. engaged by eyes 114 projecting rearwardly fromthe outer plate 68 of the boring head 52. This construction ispreferably present at each end of the chip pan 106iiriorder to obviateunbalanced'strain upon the" boring head 52.

Thus in operation when theboring heads 12o are moved away from oneanother to open position, longitudinal movenintof the rack bars 111 willturn the chip pan; 106 to ,vertical positionas shown in Fig. 35,,toprovide for the passage thereby ofLthe released. and

the chip pan 106 to the horizontal position shown in Fig. 36.

Referring now to Figs. 4 and 8," it will be noted that the plates 69 atthe inner sides of-the grooved ring 64 of each of the boring heads 52and 53, and centrally through which the shafts 54 and 55 are projectedinwardly into the space between the inner and outer side plates 62 and63, are connected. by a. wall 115 in spaced parallel relation to asimilar wall 116 connecting the inner side plates 62 at the relativelyopposite sides of the respective boring heads, said opposed spaced walls115'and 116 having annular. grooves 117 opposite one another aud inhorizontal series to receive rollers 118 carried by projectionsextending from opposite faces of a series of gear wheels 119 havingspaced and squared bores receiving the squared outer ends 120 of ahorizontally alined series of master bits 121 which series projectinwardly midway between the upper and lower ends of the boring heads,and through openings 116 in the plate 116, as best seen in Figs. '5 and8.

In this or some similar manner the master bit gears 119 are rotatablymounted.

By reference to Fig. 4 it will be. noted that the master bits 121 of thetwo boring heads 52 and 53 arranged in horizontal series as beforedescribed, bore through the blanks 97 in-opposite directions, the innerportions of these master bits extending through openings 122 oftransverse bars 122 which, with their end pieces 122 form guide framesmidway between the upper and lower edgesof each boring head for theupper and, lower'bit frames 123 and 124 thereof, as seen particularly inFigs. 8 and 13, the said guide frames being bolted by bolts 122, seeFig. 7, through their end pieces 122", to the inner side plates 62 so asto move with the boring heads. It will be noted that the upper and lowersurfaces of the guide frames are 1 inclined in conformity with theinclination of the adjacent edges of thebit frames 123 and 124, thelatter of which are thus shifted toward one another in each boring headby virtue of their relative movement with respect thereto and which isbrought about by the-mechanism to be presently described, it being alsonoted that the inner surfaces of the inner side plates 62 are'providedabove and below said guide frames with parallel guide grooves 62 .intowhich project rollers 123 and 124 extending from the ends of the bitframes 123 and 124, see Figs. 8, 13, and 23.

Each of the bit frames includes inner and outer plates 125. and 126 andan intermediate plate 127, and between these plates are mounted twoseries of bits 128, one series having short stems 129 projecting throughthe inner plate 125 as seen in Figs. 15 and 16, with the heads thereofbetween the inner and intermediate plates 125 and 127 and the otherseries having long stems 130 projectbetween the outer and intermediateplates 126 and 127..

Each of the bits, so disposed, has its head in the form of an ovoid, andprovided with longitudinally Q extending teeth 131, its rounded endportions being rotatably supported inrecesses 134 in the surfaces of theplates 125, 126, and 127, as seen by reference to Fig. 22, although thebits may have integral spherical end knobs 135 to form the bearingsthereof, as seen in Fig. 28, or their heads, provided with such knobsatone end, may be separate from their stems with intervening knobs 135,joined by extensions 136 of either the heads, as seen in Fig. 26, or thestems, as seen in Fig. 27.

It willfibe noted from Fig. 22 that the recesses 134 are disposed so asto maintain the several bits of the bit frames in desired relation inrespect to the plane of movement of the bit frames, these bits beingarranged in vertical serieswithin each bit frame, of which the heads ofthe outer bits of the series are in engagement with the bit rotatingears 133, so as to be driven thereby.

y a comparison of Figs. 15 and 16 it will be noted that the movements ofthe bit frames, as described, provide for the boring of angular openingsin the blanks in quick clean movements. As seen in Figs. 9 and 12 inparticular, each of the bit frames 123 and 124 of the boring head 53,has its ends provided with vertically slotted openings 139 in whichextend cams 140 secured upon the inner ends of short shafts 146'whichlatter extend into the spaces between the side plates 62 and 63 and arethere provided with gears 147 in operative engagement through idlers 149and 150 with bevel gears 151 which, as seen in Fig. 5, are in mesh .withthe bevel portions 152 of geaf wheels The gears 133 before mentioned,driving the series of bits of the bit frames 123 and of a pairofrelativel" movable boring heads,-

' .mo em 2 i on end'adj w th the cam shaft gears'147 and 157 as in Fig.9.; 'llhus, the eccentric gears 160 will fellow the .movements of thebit frames relative to the boring heads during inward and 6 outwardmovement of the latter, so as to -rema1n in uniform engagement with thebevel gears 133 at all times. 7 Thus,:it' will be understood, inoperation when the boring heads 52 and 53 are moved 1. toward oneanotheragainst blanks 97. disposed .therebetween, theseveral bit frames 123and-124are shifted with'respect to and upon theinner'fixed .side plates62 of the boring heads, as the bits 129 and 130 pass through; the blanksso as to efiect a quick --clea-n movement, of the samein operation, itbeing understood of course that the same is 'true when the heads aremoved apart so as ,to withdraw the several bits '129 and 130 with justas quick and clean'movements as is provided in thrusting the same intothe blanks. 1 r

a It is obvious furthermore that'the several master bits 121 engagetheblanks in the first 1f instance, extending as they do, as'before exthe'boring heads, and thus clamp thej-blanks'firmly in position for theproper 1 master bits and the bits of the bit frames 123 and'124. a

Iclaim: f 1

1. In'a boring machine, the combination each having a pair of.oppositely rotating members provided with pro ecting lugs, arms andhaving-inner free ends engageable by said lugsto raise tbielarms, avertically movsevem-bparts are m 'unted, having a receptacle-forb1ank's, ap ir of arms pivoted for 'ent into and out of said receptacle,

connectionsattached at one end to d vjigw: a dlg tending through theouter secumd tdfihe opposite ends'ofsmd flexible controlling connectionsbetween last-:named and one of the boring the combination Q12 1113aboring machine,

ir of oppositely rotating rings adjacent h for' head, provided'with proectlng "etrica ly opposedlugs, arms plvoted at acent said members andhaving imierffree .end s beneath whlch the said lugs garezengageableinthe. rotation of said menu "bers ',to;railse,,the,armsat intervals,'11 verti- 'ght engagedand elevated arms, grappling members securedtothe op plained, between the upper and lower bit;

tached, and means for raising and lowering boring heads, and

Y "pivoteduat one end adjacent said members 540' v verticaLmovementsna'frame in which thesaid grappling members with respect to the endsof thelast named arms, grappling mem 1,

"fiexibleconnections.for-movements withsaid arms intoand out of theblank receptacle,

pairof relatively movable boring heads,

by the said armsin'their upward movements, i a frame in which theseveral, parts are; mounted, having. a receptacle for blanks, a. palr ofarms pivoted intermediate their ends nthe frames for movements'at oneendinto '70 and out ofu he said receptacle, flexible c01 a nectionsattached to said weight and extend mg through the said ends of the lastnamed posite ends of said flexible connections for movements with saidarms into and out of I the blank receptacle, and flexible controllingconnections-extending between the opposite ends of the last. named armsand one of the s'aidboringheads. i

3. In a boring machine, the combination with a pair of spaced relativelymovable boring heads, and a frame, within which said boring heads areadjustable, having a blank receptacle, of a pair of arms pivoted in theframe and movable into and out of said receptacle above the boring headsand having controlling connections with one of said boring heads, a pairof grappling members movable with said arms," and automatically con whenthe latter are over the space between I which said last namedconnectionsare at,

said weight at spaced intervals.-

4. In a boring machine, the combination with a pair of spaced relativelymovable i a frame within which, said boring headscare adjustable havinga blank receptacle, of a pair of arms pivoted I in the frame and movableinto and out of, said receptacle above the boring heads and havingcontrolling connections with one of v said boring heads, a pair ofgrapphng mem bers-movable with said arms, and automatically controlledconnections for lowering armsii-when the latter are over the space Inbetween said boring heads, including fiexn ble connections extendingthrough the free ends of said arms, a vertically adjustablef m weight towhich said last named connections are attached, pivoted "arms havingtheir free ends'engageable with the weight to raise the same, 7 membersadjacent one, off-the boring heads having projecting Iugsengageable withand j disengageable from the last named arms in the rotation .ofthe sad,members, v,

5. Ina boring machine, the comb tlon with a pair'of spaced -relat1velymovable boring heads, and a frame with n which saidboring headsare adustable, having a; blankireceptaclta-of' a pair 9f arms pivoted. intheframeand'movabl I wandre epmie- 90 trolled connections for lowering saidgrapzpling members with respect to the arms and oppositely rotating 1:0

said boring heads, a'pair of grappling mem-- havingcontrolling'connections with one of bers-movablewith said arms, andautomatically controlled connections for lowering said grappling memberswith respect to the arms when. the latter are over the space betweensaid boring heads, including flexible weight controlled connectionscarrying the said grappling members and extending through portions ofthe said arms, and with which the grappling members are movableindependent of the arms. v

6. In a'boring machine, the combination with a'pair of spaced relativelymovable boring heads, and a frame within which said boring heads areadjustable, having a in the frame and movable into and out of saidreceptacle above the boring heads and haV-in" controlling connectionswith one of said boring heads, a pair of grappling members movable withsaid arms, and automatically controlled connections for lower-.

ing said grappling-members with respect to the arms, when the latter areover the space between the said boring heads.

7. In a boring machine, the combination with a pair of 's ,acedrelatively movable boring heads an a frame within which said boringheads are adjustable having a blank receptacle, of means for automat1--cally withdrawing blanks fr m said receptacle and feeding the samebetween said heads, including a pair of grappling-members having spursfor engaging the blanks,

, means for moving said members into and out of said receptacle, andother means for. raising and lowering said members into and out of thespace between said boring heads.

8. In a boring machine, the combination with a pair of relativelymovable boring heads, and a frame within which said boring heads areadjustable, having a blank receptacle, of means for automaticallywithdrawing said blanks from said receptacle and feeding the samebetween the said boring heads, including'a pair of grappling menibershaving means for engaging the sides of the blanks, and means carried. bythe boring heads and movable therewith to disengage the grapplingmembers from the blanks when the boring heads are inovedtoward oneanother.

9. In a boring machine, the combination with a pair of relativelymovable boring heads, and a frame within which said bor- 'ing heads areadjustable, having a blank receptacle, of means for automaticallywithdrawing blanks from said receptacle and feeding the same between thesaid boring heads, including a pair ofgrappling members having means forengaging the sides of the blanks,-'and means carried by the boring,heads and movable therewith to disengage the grappling members from theblanks :when the boring heads are moved toward one another, includinglugs having inclined faces and engageable between the blanks and thegrappling members to force the latter away from the blanks.

10. In a boring machine, the combination with a pair of boring headsbetween which a blank is held during the boring operation, movable awayfrom one another to permit through the trough openings. blankreceptacle, of a pair of arms pivoted 11. In a boring machine, thecombination of a pair of boring heads between which a blank is heldduring the boring operation, movable away from one another at the end ofthe boring operation to permit the blank to drop, of a trough below theboring head having a lower opening through which the blanks are guided,a normally horizontal chip pan below the trough opening, a dischargechute for the blanks below and at one side of the said chip pan, adis'charge chute for the chips below and vat the opposite side ofthechip pan, and means for periodically tilting the said, chip pan topermit of the passage of a blank thereby andto discharge the contents ofthe pan into the said chip discharge chute.

12. In a boring machine, the combination with a pair of boring head'sbetween which a blank is held during the boring operation,

movable away from one another at the end of the boring operation topermit the blank to drop, of a trough below the boring head having alower opening through which the blanks are guided, a normally horizontalmit of the passage of a blank thereby an to discharge the contents ofthe pan into the said chip discharge chute, said means includingconnections leading to and actuated byone of said boring heads, wherebyto time the tilting movement of the chip pan with the movement of theboring heads to release the blanks. r w

l3. In a boring machine, the combination wlth a pair of boring headsbetween which a blank is held during the boring operation,

movable away from one 'anotherto' permit the blankto drop at theend ofthe-boring lot operation, of.'a trough below the boring heads having alower opening through which the blanks are guided, and an linclined;

mto which the blanks are" movablefthrough discharge chute below the saidtrough and the trough opening, a normally horizontal chip pan belew thetrough opening, and means for .tiltlng said pan to'permlt of the passageof the blank thereby.

14;. In a-boring machine, the combinatior of a pair of relatively'movabl boring heads,

'- of a chip pan'norjmallydisposed in horizontal position below saidboring heads for receiving the chips therefrom, an inclined" ceiving thechips therefrom, an inclined chip. discharge chute at one side of andbelow said chip pan, and means for periodically tilting the chip pan todischarge" its contents into said chip chute tal position below saidboring heads for rechip discharge chute at one side of and be itscontents,

low said chip pan, and means for periodically tilting' the chip pan todischarge its contents into said chip chute, said means in-. cludingconnections leading to. and actuated by one of said boring heads,whereby to time the movementof said chip pan with that of the boringheads. l 16.- Ina boring machine, the combination with a frame and a"pair of relatively movable boring heads in the frame, of a chippandisposed'below the said boring heads andnormally in a horizontalposition, said pan being provided with end trunnions, bearings carriedby the frame and in which said trunnions are journaled, agear wheelsecuredupon'one of the trunnions,a rack bar having movement in the frameand engaging said gear wheel, and connections between the rack bar andone of said boring heads whereby to tilt the chip panin timed relationto the movements of the boring heads for discharging 17. In aboringmachi'ne, the combination of a pair of boring heads m'ovablerelatively to one another in a horizontal plane and each havingoutstanding shafts adjacent the opposite sides thereof, provided, withsquared outer portions, rotating rings dis- I posed on each of the saidshafts and having toothed inner peripheries, seriesof "gears connectingthe said inner toothed peripheries of the rings with said shafts, saidrings also having outer cam grooves, a frame, in which said'headsaredisposed having rigid lugs projecting intothe said grooves, spacedplates rigidly connected to each head and etween which-the said ringsare rotatably supported in connection --With' the heads,

' shafts rotating in thefr'ame in axial alinement withsaid first namedshafts and hav ing squared sockets receiving the squared shaft ends,andmechanism for rotatingsaid lastfnamed shafts. a I

' "18 In a boring machine, the combination of a pair of boring headsmovable relatively to one another-in. a horizontal plane and? eachhaving outstanding shafts the opposite sides thereof, provided withsquaredouter portions, rotating rings dis;

posed on eachv of the said shaftsandjha ving toothed inner peripheries,series gears connecting the said inner toothed peripheries of.

the rings with the said shafts, said rings also having outer camgrooves, a frame in which said heads are disposed havingrigid lugsprojecting'into the said grooves, s aced plates rigidly connected toeach hea [and between which the said rings-are rota'tably supporteddnconnectionQwith the heads,

shafts rotating in the frame inflaxial' alinenient with said first.named shafts and hay;

ing squared sockets receiving the. squared L-shaft ends, and mechanismfor rotating said last named shafts, including a'driven shaft having amastergear adjacent each boring head, drivingjmeans for saidshaftsfigearson sa1d socket shafts, oneiof whid hhis in gmesh with therespective master gear, an

in which said heads are disposed, having rigid lugs projecting 'intosaid grooves, shafts rotating in the frame in axial alinement with saidfirst named shaftsand having squared sockets .receiving the squaredshaft ends, and mechanism for rotating saidlast named shafts. e

20, In a boring machine, the combination of a pai-r of boringheadsmovablerelatively to one another in ahorizontaljpla'ne and eachhaving outstanding shafts'provided with squared outer portions,rotating'rin gs disposed on and geared to said shafts; and provided withannular vcamgrooves, a frame- -in which said heads are disposed havingrigid lugs projecting into said grooves,

ing squared sockets receiving the squared "shaft ends. and mechanism forrotating said last named shafts including a driven shaft shafts rotatingin the frame in axial alinement. with said first named shafts andhavhaving a master gear adjacent each boring head. gears on said lastnamed shaft,- one of which is in mesh with the respective mas ter gear,and an intermediate gearfconnec'te ing the master gear with the: othergear:

shaft.

21. Ina boring machine, the combinati n I of a pair, of boring headsmovable relatively,

to one another, in a horizontal 'plane,'andeach having spaced rigidside' plates and spaced walls connecting said-side plates and extendingalong 'the head, a series of master bits extending fl l h i's wan ofeachbead, gears" on said master bits and. in-ah'eshwith one another betweenthe said walls, apair of driven shafts extending into-each head and'into the space between the said side walls, said shafts having gearsin mesh with the master bit gears, upper and lower bit frames above andbelow the master v bits of each head'having series of bits thereingearedly. connected to one another, means for, driving said'bits of thebit frames, and

means within the head supporting the said bit frames for movementinwardly with respect tothemaster bits, and independent of the movementof the heads. v

22., In a' boringmach'ine, the combination and in mesh with one anotherbetween the said walls, a p'air of driven shafts extending into-eachheadland into the-space between the ,said side walls, a pair ofbitframes in each-head, said bit frames being shiftable with-reference tothe master bits, and'movablenwith the heads, and 'fneans for movingsaid'l-bit framesindependent of the move mentof the heads during themovements of- "thel'atter. I

. 23.. In a boringmachine, thelc' ombination of azpair of boring headsmovable relatively to [one another in a horizontal plane I and I eachhaving spaced .-rigidside plates and 5 spaced walls connecting said sideplates and L hitslextending inwardly through the inner extending along'the'head, aserie's of master w'allofeach head, gears on, said masterbits. and in mesh with one another between the I ,sa-idjwalls'a pair ofbit frames in'each' head, "a pair" ofdriven shafts'exte'nding-into eachhead- 2 and into the space between; the said sidewalls. saidbit-fram'es'ofeach liead be ing movable with the head andslidable-relatively to the head, and connections for moving the framesof each head inwardly and outwardly with respect to the master bits'thereof, i

: 24:, In a borin'g machine, the, combination I of a pair of boiling heas 'movable relatively. tofone another a horizontal plane and eachlhaving spaced rigicl -side plates-and s'paced walls connecting said sideplates and extending along the head, a seriesof master bits extending.inwardly through the inner wall of .each'head, gears-on said masterbitsand in mesh'with .0118 another between the said wal ls,"a pair of drivenshafts extending into leachhea'dj and into the space between the saidsidewalls, a pair of bitfra'me's in ,eachhead, said bitframesof eachhead being. disposed above and below the master. hitsand movable-withthe head, guide frames thereof! dispose headsh'eing provided withteeththereon', the

in each head and with respect to which the bit frames are movable, and;means-including a series of gears disposed in the spaces be tween therigid side plates for actuating the bit frames from the said shafts.- V25. In a boring machine the combination of apair of boring headsmovable-relatively to one anotherin a horizontal plane,

each having a horizontal series of master bits, u'pperand lowerbitgframes-above and below themast'er bits in each of said heads, 'a'plurality ofbits carried'by each'of thesaid bit frames andgearedly'connected to one another,v connections for rotating the masterbits, and means for shifting the bit frames'of each head with respect toone an- H other during the movements of the head;

. 26. In a boring machine the combination of a pair ofboring'heads'mo'vable relative] to one another in a horizontal lane, onehead having upper and lower it frames; therein and each frame-includingspaced walls provided in their; opposing surfaces with cavities andcertain of which have openingsv communicating with the 'saidcavities,bits extending'through the said openings and having enlarged ovoidalheads disposed be, tween the said lates and having the'ends d in thesaid cavities, said 0-8 teethib'eing in engagement with one anotherwhereby to .gearedly connect the entire series,

of bits,- connections for rotating the said-bits connections-for movingsald bit frames an shifting the same with-respect to the master loo bitsduring such movement, and a series of masterbits extending between thebit frames I ofthehe'ads'."

27.- Ina boring machine, the combination of a pair of boring headsmovable relatively 101; to one another ina horizontal plane, a pair-- ofbit framesdisposed 'in vertically spaced relation in each of said heads,bits carriedby' the-said bit frames, connections for moving 1 the headstoward and away from one another with the said bit frames, andconnections for? moving the bit frames with respect to said boring headsduring the movements ofthe heads. v

28. In a boring machine, the combination of relatively movable boringheads,- upper andlower series'of relatively shiftable bits} in-each ofthe boring heads, and'a seri'es'of bitsin each head projectingpermanently in a horizontal plane at the'center thereofand between saidfirst series.

1 29. In aborlng machineggthe'combination,

of relatively movable boring heads, each'of which is prov ded theremwith' series of" angularly disposed bits-movable therewith" 12b andshiftable with respect theretolduring the a movement of the heads.

' :30. In a boringmaeh -ingflthe eaalbimnon ofboring'heads-mova'bltoward andaway I from one another, and-series of boring bits' in eachhead movable therewith and shiftable verticall and horizontally withrespect thereto during such movement.

31. In a boring machine, the combination with a pair of spacedrelatively movable boring heads, and a frame within which said boringheads are adjustable, having a blank receptacle of means forautomatically withdrawing blanks from said receptacle and feeding thesame between said heads; including a series of clamping members forengaging and holding the blanks in pairs in said receptacle, andgrappling members movable into and out of said receptacle and havingmeans for. engagement with said clamping members.

32. In a boring machine,,the combination with a pair of'spacedrelatively movable boring heads, and a frame within which said boringheads are adjustable, having a blank receptacle, of means forautomatically withdrawing blanks from said receptacle and feeding thesame between said heads, including a series of clamps, each having meansto engage and hold a pair of blanks and having side openings, andgrappling members movable into and out of the receptacle and havingspurs for engagement within the side openings. of said clamps.

33. In a boring machine, the combination with a air of spaced relativelymovable boring hea s, and a frame within which said boring heads areadjustable, having a blank receptacle, of means for automaticallywithdrawing blanks from said receptacle and feeding the same betweensaid heads, including a series of clamps, each having means to engageand. hold a pair of blanks and having side openings, and grapplingmembers moving a sp able into and out of the receptacle and having spursfor engagement within the side openings of said clamps, said receptaclehaving rollers at the sides of its blanks and against which saidgrappling membersvengage to shift the latter toward the blanks and thesaid clamps.

34:. In a boring machine, of the character described, bit frames,'eachhaving spaced bit plates provided with companion recesses in theiropposing faces, and bits having their heads between said plates withportions extending into and rotatable within said recesses.

35. In a boring machine of the character described, bit frames, eachhaving spaced bit plates provided with companion recesses in theiropposing faces, and bits having their heads between said plates andprovided with spherical projections rotatable within said recesses.

36. In a boring machine of thecharacter described, bit frames eachhaving spaced bit plates provided with companion recesses in theiropposing faces, and bitscach having a head and a shank, the head beingdisposed between said plates and having a spherical projection at oneend to enter the corresponding recess of one of the plates, and alsohaving a recess at its opposite end, and the shank extendin through theother plate and havfierical projection at its inner end to enter therecess of the latter plate and the recess of the head,said head and saidshank projection having relatively engaging squared openings andextensions, for the purpose described.

EMMA 'r. MILLER.

